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Certain Balance Sheet Components (Tables)
 12 Months Ended
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]  
Prepaid Expenses and Other Current Assets
The following tables provide details of selected balance sheet components (in thousands):
 
December 31,
 
2017
 
2016
Prepaid expenses and other current assets:
 
 
 
   French R&D tax credits receivables (1)
6,609

 
5,895

   Deferred cost of revenue
4,440

 
6,856

   Prepaid maintenance, royalty, rent, property taxes and value added tax
3,867

 
5,526

   Restricted cash (2)
530

 
731

Other
3,485

 
7,311

      Total
$
18,931

 
$
26,319


(1) The Company’s acquired TVN subsidiary in France (the “TVN French Subsidiary”) participates in the French Crédit d’Impôt Recherche (“CIR”) program (the “R&D tax credits”) which allows companies to monetize eligible research expenses. The R&D tax credits can be used to offset against income tax payable to the French government in each of the four years after being incurred, or if not utilized, are recoverable in cash. The amount of R&D tax credits recoverable are subject to audit by the French government and in the year ended December 31, 2017 and 2016, the French government approved the 2013 and 2012 claims and refunded $6.4 million and $5.8 million to the TVN French Subsidiary, respectively. The remaining R&D tax credit receivables at December 31, 2017 were approximately $28.5 million and are expected to be recoverable from 2018 through 2021 with $6.6 million reported under “Prepaid and other Current Assets” and $21.9 million reported under “Other Long-term Assets” on the Company’s Consolidated Balance Sheets.
(2) The restricted cash balances are held as cash collateral security for certain bank guarantees. These restricted funds are invested in bank deposits and cannot be withdrawn from the Company’s accounts without the prior written consent of the applicable secured party. Additionally, as of December 31, 2017, the Company had approximately $1.2 million of restricted cash for the bank guarantee associated with the TVN French Subsidiary’s office building lease. This amount is reported under “Other Long-term Assets” on the Company’s Consolidated Balance Sheets.
Inventories
 
December 31,
 
2017
 
2016
Inventories:
 
 
 
   Raw materials
$
2,881

 
$
9,889

   Work-in-process
933

 
2,318

   Finished goods
10,130

 
17,776

   Service-related spares
12,032

 
11,210

      Total
$
25,976

 
$
41,193
Property and Equipment
 
December 31,
 
2017
 
2016
Property and equipment, net:
 
 
 
   Machinery and equipment (1)
$
87,121

 
$
97,989

   Capitalized software
35,139

 
34,519

   Leasehold improvements
15,051

 
14,455

   Furniture and fixtures (1)
6,534

 
8,993

      Property and equipment, gross
143,845

 
155,956

      Less: accumulated depreciation and amortization (1)
(114,580
)
 
(123,792
)
         Total
$
29,265

 
$
32,164



(1) The reductions in these balances in 2017, compared to 2016, were due to retirement of fully depreciated assets.
Accrued Liabilities
 
December 31,
 
2017
 
2016
Accrued and other current liabilities:
 
 
 
   Accrued employee compensation and related expenses
$
16,414

 
$
19,377

Customer deposits
5,020

 
4,537

Accrued warranty
4,381

 
4,862

Contingent inventory reserves
3,806

 
2,210

Accrued TVN VDP, current (1)
3,186

 
6,597

Accrued royalty payments
2,195

 
1,912

   Other
13,703

 
15,655

      Total
$
48,705

 
$
55,150


(1) See Note 10, “Restructuring and related charges” for additional information on the Company’s TVN VDP liabilities.